package com.first.core.util;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.beanutils.DynaProperty;
import org.apache.commons.beanutils.PropertyUtilsBean;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class BeanUtil
{
  private static Log log = LogFactory.getLog(BeanUtil.class);

  public static void copyNotNullProperties(Object dest, Object orig)
    throws IllegalAccessException, InvocationTargetException
  {
    BeanUtilsBean beanUtils = BeanUtilsBean.getInstance();

    if (dest == null) {
      throw new IllegalArgumentException("No destination bean specified");
    }
    if (orig == null) {
      throw new IllegalArgumentException("No origin bean specified");
    }
    if (log.isDebugEnabled()) {
      log.debug("BeanUtils.copyProperties(" + dest + ", " + orig + ")");
    }

    if ((orig instanceof DynaBean)) {
      DynaProperty[] origDescriptors = ((DynaBean)orig).getDynaClass()
        .getDynaProperties();
      for (int i = 0; i < origDescriptors.length; i++) {
        String name = origDescriptors[i].getName();

        if ((!beanUtils.getPropertyUtils().isReadable(orig, name)) || 
          (!beanUtils.getPropertyUtils().isWriteable(dest, name))) continue;
        Object value = ((DynaBean)orig).get(name);
        beanUtils.copyProperty(dest, name, value);
      }
    }
    else if ((orig instanceof Map)) {
      Iterator entries = ((Map)orig).entrySet().iterator();
      while (entries.hasNext()) {
        Map.Entry entry = (Map.Entry)entries.next();
        String name = (String)entry.getKey();
        if (beanUtils.getPropertyUtils().isWriteable(dest, name))
          beanUtils.copyProperty(dest, name, entry.getValue());
      }
    }
    else {
      PropertyDescriptor[] origDescriptors = beanUtils.getPropertyUtils()
        .getPropertyDescriptors(orig);
      for (int i = 0; i < origDescriptors.length; i++) {
        String name = origDescriptors[i].getName();
        if ("class".equals(name)) {
          continue;
        }
        if ((!beanUtils.getPropertyUtils().isReadable(orig, name)) || 
          (!beanUtils.getPropertyUtils().isWriteable(dest, name))) continue;
        try {
          Object value = beanUtils.getPropertyUtils().getSimpleProperty(orig, name);
          if (value != null)
            beanUtils.copyProperty(dest, name, value);
        }
        catch (NoSuchMethodException localNoSuchMethodException)
        {
        }
      }
    }
  }
}
